One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,12)(4,9)(5,10)(6,15)(7,11)(8,13)(14,16)(20,27)(22,28)(23,30)(25,31)(33,34)(35,42)(36,40)(37,45)(38,41)(39,43)(44,47)(46,48) involution — undirected(1,3,7,4)(2,8,11,16)(5,13,6,14)(9,15,12,10)(17,18,21,24)(19,22,26,28)(20,23,27,30)(25,29,31,32)(1,4,7,3)(2,9,11,12)(5,13,6,14)(8,15,16,10)(17,19)(18,22)(20,25)(21,26)(23,29)(24,28)(27,31)(30,32)(33,35)(34,39)(36,43)(37,46)(38,44)(40,47)(41,48)(42,45)(1,5,7,6)(2,10,11,15)(3,13,4,14)(8,9,16,12)(17,20,21,27)(18,23,24,30)(19,25,26,31)(22,29,28,32)(33,36,38,37)(34,40,41,45)(35,43,44,46)(39,47,48,42)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.